Stop-motion.



P. AINSWORTH.

STOP MOTION.

APPLICATION FILED NOV. 8, 1912.

Patented Dec. 23, 1913.

V 1 R m k. L m W w im w a L I..::.::.T:.::mu m m M \Jwbk W a. a m .l I 8 H1 W w. km MN fl \n v 8% AN ATTORNEYS F. AINSWORTH.

STOP MOTION.

APPLIOATION FILED NOVi 8, 1912.

WITNESSES mmmavwa A ATTORNEY FRANKLIN AINSWORTH, OF NEW YORK, N. Y.

STOP-MOTION.

Specification of Letters Patent.

Patented Dec. 23, 1913.

Application filed November 8, 1912. Serial No. 730,177.

To all whom it may concern:

Be it known that I, FRANKLIN AINSWORTH, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York have invented a new and Improved Stop-Motion, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved stop motion more especially designed for use on sewing machines and the like, and arranged to automatically stop the machine whenever the needle thread or the shuttle thread breaks or runs out, and topermit of conveniently applying the stop motion to sewing machines as now constructed.

For the purpose mentioned, use is made of a pivoted arm engaged by the sewing or needle thread of the sewing machine, an oscillating arm actuated from a movable part of the sewing machine, and a stopping mechanism for the machine, the said oscillating arm oscillatin in close proximity to and free of the sai pivoted arm until the latter is released by the sewing thread and passes into the path of the said oscillating arm to actuate the said stopping mechanism with a view to stop the machine.

A practical embodiment of the invent-ion is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is an elevation of the rear side of the sewing machine provided with a stop motion; Fig. 2 is a face view of the head of the sewing machine provided with the stop motion; Fig. 3 is a cross section of the same on the line 33' of Fig. 1; Fig. 4 is a similar view of the same and showing the parts in a different position; and Fig. 5 is a sectional plan View of the same on the line 5-5 of Fig. 3. v

The sewing machine A on which the stop motion is shown applied may be of any approved construction and having the usual reciprocating needle A through which passes the sewing thread B from the take-up A and through which take-up passes the sewing thread by way of the tension devices A A and a guide pin A, all arranged on the head A of the sewing machine. The thread B during its passage from the guide A to the tension device A passes around a pin C held on the upper end of an upright the sewing machine. A spring C presses the swing arm C in a rearward direction. The swing arm C is provided with a shoulder C normally out of engagement but adapted to be engaged by the free end FF of an oscillating arm E secured on a shaft F journaled in a bracket G attached to the sewing machine frame at the rear thereof. On the shaft F 4 is mounted to turn loosely a sleeve F 5 provided with an arm F connected by an eccentric rod F with an eccentric F 8 held on the shaft A of the sewing machine so that a constant rocking motion s given to the sleeve F as long as the sewmg machine is running. One end of the sleeve F 5 abuts against a collar G secured on the shaft F, and the other end of the sleeve is engaged by a friction washer W pressed on by the hub WV of an arm WV by the action of a spring W coiled on the shaft F and bearing against the hub WV- at one end and bearing against a collar F on the shaft F, as plainly indicated in Fig. 5.

The hub W is provided with a notch 7* into which extends a pin W projecting from the shaft F so that the hub \V turns with the shaft F and at the same time is free to slide in the direction of the axis of the shaft F. The spring W presses the hub W with sufficient force against the friction washer WV so that the latter turns with the hub \V, and as the washer \V rocks with the sleeve F a swinging motion is given to the arm V On the arm V is secured a pin l/V extending between two pins 1 and 2 projecting from the sleeve F the pin W being normally in contact with the pin 1. The arm V is provided with a shoulder normally out of engagement with the lower end of an arm X fulcrumed at X on a lever X fulcrumed at X on a bracket G The arm X is pressed forwardly by a spring X and the forward swinging movement of the arm X is limited by a stop pin X on the lever X. The upper end of the arm X is provided with a handle X under the control of the operator for stopping the machine by hand whenever it is desired to do so. The lower end of the lever X is connected by a link X with a suitable mechanism for stopping the sewing machine. Now when the parts are in the position shown in Fig. 2 the arm C is held out of engagement with the oscillating arm E by the action of the thread B, but in case the thread breaks the arm C is caused to swing rearwardly by the action-of the spring C so that the shoulder C is engaged by the free end of the arm E and the latter is now held against rotation in a downward direction whereby the shaft F is held against rocking movement. The sleeve F on turning causes its pin 2 to move in contact with the pin W'", and on the next upward movement of the arm F the arm X can engage the shoulder V (see Fig. 4), and on the following down stroke of the arm F an upward swinging movement is given to the arm W to cause a swinging of the lever X with a View to move the clutch mechanism into action to stop the sewing machine.

The pins 1 and 2 are spaced apart a distance corresponding approximately to the throw of the eccentric F and the diameter of the pin W is about one-half the said disexplained, the arm W is held against upward movement. The next downward .movement of the eccentric F and arm F causes the pin 2 to move upward into contact with the pin WV and on the next upward, movement of the eccentric F and the arm F the arm WV is caused to swing downward owing to the friction washer W between the sleeve F and the hub W. The shoulder W' of the arm W now passes under the arm X and on the next downward movement of the eccentric l5 and the arm F the pin 2 swings the arm W upward to actuate the lever X and the clutch mechanism as previously explained.

It is understood thatthe same action as above described takes place in case the shuttle thread breaks or runs out instead of the sewing thread B. It is also understood that the eccentric F is set on the shaft A in such relation to the take-up A that whenever the latter is in uppermost position the free end of the oscillating arm E is opposite the notch C and hence when the thread 1." A stop motion for sewing machines,

comprising a spring-pressed pivoted arm mounted to swing transverselyon the head i of the sewing machine, the-free end of the said arm being engaged by "the sewing thread and the said free end having a shoulder, an oscillating arm normally out of engagement with the shoulder of the said, pivoted arm until the latter is released by the sewing thread, a shaft carrying the said oscillating arm, a sleeve loose on the said shaft, means for rocking the said sleeve from a movable part ,of the sewing machine, and a friction device connected with a stop mechanism for the sewing machine and connected with the said sleeve to cause the latter to normally rock the said shaft and to actuate the stop mechanism on stopping the oscillation of the shaft on the said oscillating arm engaging the said shoulder.

.2. A stop motion for sewing machines and the like, comprising a spring-pressed swing arm mounted to swing and engaged by the sewing thread, an oscillating arm normally out of engagement with the said swing arm until the latter is released by the thread, a shaft carrying the said oscillating arm, a sleeve loose on the said shaft and provided with two spaced pins, means for rocking the sleeve from a movable part of the machine, an arm having a pin extending between the said spaced pins and having its hub mounted to turn with and to slide on the said shaft,

a friction disk between the said sleeve and hub, a spring'pressing the said hub, and a stopping mechanism for the machine and controlled by the said last-mentioned arm.

In testimony whereof I have "signed my name to this specification in thepresence of two subscribing witnesses.

FRANKLIN AINSWORTH;

Witnesses:

Tnno. G. HOSTER, J r., PHILIP D. ROLLHAUS.- 

